Thread guide for thread winding machines



May 19, 1942. H. DERSEN 2,283,419

THREAD GUIDES FOR THREAD WINDING MACHINES I Filed March 15, l941 2Sheets-Sheet 1 In ven Zor: Hem r/c/I Dense/1 A; awmw/m May 19, 1942. H.DERS EN THREAD GUIDES FOR THREAD WINDING MACHINES Filed March 15 1941 2Sheets-Sheet 2 @Mwz 76 Inven 201': He/flr/ch' Dense/1 6%45, WMMMPatented May 19, 1942 UNITED; STATES (PATENT orricE THREAD GUIDE roaTHREAD WINDING MACHINE Heinrich Ders'en, Krei'eld, Germany ApplicationMarch 13, 1941, Serial N0. 383,066 In Germany June 26, 1939 10 Claims.

intersecting at one or more points of the circumference. In such threadguides the thread guided in one groove for being moved longitudinally ofthe bobbin in one direction frequently engages in the oppositelydirected groove as it passes a point of intersection.

The object of the improvements is to provide means for preventing thethread from thus leaving the proper groove and with this object in viewmy invention consists in providing subsidiary guiding means which areadapted to engage the thread passing a point of intersection and to holdthe same in the proper position.

For the purpose of explaining the invention an example embodying thesame has been shown in the accompanying drawings in which the samereference characters have been used in all the views to indicatecorersponding parts. In said drawings Fig. 1 is a diagrammatical sideelevation of the thread winding apparatus, a

Fig. 2 is an elevation partly in section and showing a cross-woundbobbin and the guiding means,

Fig. -3 is a sectional elevation on an enlarged scale taken on the line3-3 of Fig. and showing the subsidiary guiding means,

Figs. 4 and 5 are respectively an elevation and a plan view on anenlarged scale showing the subsidiary guiding means,

Figs. 6. and 7 .are similar elevations showing the guiding means indifierent positions,

Fig. 8 is a diagram showing a development of the grooved drum andsubsidiary guiding means, and

'Fig. 9 is a development of the roller carrying the subsidiary guidingmeans.

The thread winding apparatus comprises a spool i from which the thread 2is'taken, a brake 3, a grooved drum 4, and a bobbin 8. The drum 4 isformed .with two helical grooves 8 having oppositely directed pitchesand merging into each other at the ends of the bobbin I, the saidgrooves being adapted to impart the traverse to the thread being woundinto a cross-wound bobbin. The drum 4 is mounted in bearings 9. In

addition to the drum 4 guiding means are provided which are in the formof a roller 5 mounted parallel to the drum. 4 in bearings H andoperatively connected with the drum 4 by V gear wheels l2 and I3, thesaid roller 5 being provided with wings or lugs 14 and I6.

Referring now to the diagrammatical elevation shown in Fig. 8, thegroove 6 of the drum comprises portions 6a, 6b, 6c, 6d, 6e and 6f,inwhich the thread. is guided for imparting thereto the traverse fromthe right to the left and from the left to the right of the bobbin, and,when the drum 4 rotates in the direction of the arrow 0: the sections6a, 6b and 6c carry the thread from the left to the right and thesections 6d, 6e and 6f carry the same from the right to the left. As

shown. the said sections of the groove intersect at the points 20 and2|. The thread 2 is supplied to the drum from a pointlocated on themedian line A, A of the'drum, and it is inclined from the said line moreor less. While the thread engages in an unbroken part of the groove itsafely engages in the same, though it is inclined from the said groove,because it is guided by the margin of the-groove, as is shown forexample at the point B. But when the drum has further advanced into theposition in which the thread merges .into thegroove at a point ofintersection, say at the point 2|, it is not supported'any more by themargin of the groove, and therefore, there is the, possibility of thethread leaving the portion 6b of the groove and getting into the portionBe' instead of getting into the portion 60. To avoid thisirregularity,subsidiary guiding means are provided which are operativewhile thethread merges into the groove at the point of intersection 2| or 20, andthe said subsidiary guiding means are disposed so as to hold the threadin alignment with the portion of the groove to be engaged thereby. InFig. 8 I have shown in full lines the groove to in which the thread, 2is engaged, and I have indicated by a small circle C thesubsidiaryguiding means. Preferably the said circle C is located so that it guidesthe thread when it merges into the groove 6b at the point B and beforethe point of intersection 2| gets into position for engagement bythethread.

The circle C is located so that in this position of the point B in thegroove 6b it engages the thread. After the drum has moved in the direc-'tion of the arrow L z: and the point of intersection 2i is in theposition 2| (shown in the figure in dotted lines) the thread must beheld to alignment with the groove 6b and therefore the circle C has beenshifted into the position C.

on the radial portion l8 of the wing and onto the The guiding meansindicated by the circle C afford abutment for the advancing thread; and

nothing more elaborate than a round abutment operation coordinated withdrum operation, to

make the described traverse in the direction of the length'of the drumwhile the drum rotates.

In a similar way a thread guided in the guidelid is first engaged by asubsidiary g'uide member represented by a circle D, and, as thepoint'xof intersection 2| moves into the position 2|, the member D ismoved into the position D.

In a similar way, subsidiary guiding members such as C and D areprovided in connection with the point of intersection 20, and therefore,where the groove has two points of intersection, four subsidiary guidingmembers are needed.

It appears therefore, that the subsidiary guiding members must be somounted that the points at which they engage the thread shall beshiftable respectively in the direction of the length of the drum 4 fromthe median line AA out-' wardly or from the ends of the drum inwardly.Further, the subsidiary guiding members must be constructed so that theydo not interfere with the traverse of the thread, and therefore, theymust be disposed so as to get out of guiding position and out of thepath of the thread after they have guided the thread through the pointsof intersection.

In Figs. 1 to 7 and 9 I have shown a preferred construction of theguiding members, the said guiding members being provided on the rotaryroller and being in the form of the said lugs or wings I 4 and IS. Thesaid roller is rotated so circles Cand D, but in lieu thereof they areformed with cam faces l6 and I! adapted to be engaged by the saidthread, thesaid cam faces being curved in opposite senses as is bestshown in. Figs. 4 and 5. In Fig. 2 I have indicated the path of thethread 2 in dashes and dots. The thread 2 engages in the portion 6b ofthe groove 6 at a point near the point of intersection 2|, andaccordingly the thread engages the rounded margin of the cam ll of thelug or wing |5 near the forward end of the cam. As the drum 4 rotates inthe direction of the arrow y and the roller 5 in the direction of thearrow 2, the point of intersection 2| is shifted upwardly, and graduallythe left hand part of the cam I'l gets into position for engagement withthe thread. The point of abutment of the lug l5 upon the thread 2 shiftsalong the cam surface I! in a direction that is longitudinal of the drum4. And by such abutment the thread is maintained in alignment with thegroove 6b. Thus, while the thread passes thecircumferential portion ofthe roller 5.

After the drum 4 has completed nearly one rotation, the thread engagesin the section 6d of the groove, and now the lug or wing -|4 gets intothread guiding position, which lug or wing has the same function as thelug or wing l5. However, it carries the thread from theleft to the rightin order to hold the same in alignment with the part 6d. Accordingly,the cams l6 and I! have oppositely directed pitches as is shown in Figs.4 and 5.

Atthe-right hand part of the roller 5 similar lugs or wings l4 and I5are provided.

It will be understood that by the rotation of the roller. 5 the lug orwing engaging the thread 2 gets out of the path of the thread after ithas guided the same through the point of intersection 20 or 2|, so thatthe thread is free to perform its traverse. The roller 5 mustbe rotatedso that the correct lug or wing |4 or I5 is in operating positionwhenever one of the points of intersection meets the thread, andaccordingly the relative movements of the drum 4 and roller 5 must beregulated. Preferably the drum 4 has a cbmparatiwely large diameter, say4 inches, and

,-with this diameter each groove extends around the circumference of thedrum with 1% windings.

This large diameter is desirable, because there are only two points ofintersection, and the number of the wings or lugs is only four. Further,

Y the coating of the bobbin is not subject to felting leaving the saidgroove. Finally the thread slides when it is running idle in the samedegree as a drum of small diameter, which felting easily occurs in caseof rayon being wound on the bobbin.

The number of\revolutions of the roller 5 is found as follows: When thethread engages in the part 6b of the groove as is shown in Fig. 2, andthe drum 4 continues its rotation, the thread passes into the groov 5cand it is moved to the left and to the reversi g point 22 shown in Fig.8. Thereafter the thread engages the part 6d of the groove and p'asses'again the point of intersection 2|. But now th lug l5 does not operate.

Now the drum has m de one rotation. The thread moves further through theparts 6e and iii of the drum, and to the reversing point l9, Now thedrum has erformed the second rotation. At the end 0 the third rotationof the drum the thread is again in the first position illustrated inFig. 2, and now also the lug or wing l5 must be in the position shown inthe said It appears therefore that whenever the drum makes threerevolutions the roller 5 must perform one revolutions However, I preferto rotate the roller 5 at higher velocity, because thereby the lug orwing is more rapidly moved out of the path of the thread, and the pitchof the cams l5 and I1 is larger. Good results have been obtained, wherethe roller 5 performs two rotations while the drum 5 performs threerotations, so that the drum and roller are rotated at the ratio of 3:2.Figs. 1 and 2 show a construction in which the drum and roller have thisratio, the gear wheels l2 and I3 having the gear ratio 2:3. It will beunderstood that this gear ratio is adapted to the diameter-of the drumand the arrangement of the groove 6 referred to above, and that thegear. ratio must be changed if the dimensions of the drum and the.arrangement of the grooves are altered.

Preferably the cams l6 and H of the lugs or wings i4 and I5 are shapedso that they engage the thread with their outer margins, and for thispurpose the walls of the said cams are perpendicular to the cylindricalwall of the roller and the said margins are rounded as is shownin Fig.3. Thus the thread slides on the said rounded margin. so that thefriction is reduced to a minimum. The thread may be automatically filedon the guide without arresting the same because the grooves of the drumand the wings or lugs it and I5 always get into the correct relativepositions. By my improved construction the thread safely performs itstraverse. It is not subject to wear, because it is only in slightcontact with the roller 5 and the rounded margin l8 of the lugs.Therefore, even threads of small elasticity can be safely guided, and Iam enabled to use the same for winding coarse threads and twines.

5. In a thread winding mechanism as defined in claim. 1, the furtherimprovement described herein, which consists in the said subsidiarythread guiding means being in the form of a lug mounted for rotatingabout an axis parallel to the axis of the said drum, said lug beingformed with a thread engaging or guiding portion extending from thepoint located forwardly in the direction of the rotary movement of saidlug laterally and rearwardly of the axisof said lug and shaped so as tocontinuously hold said thread substantially in alignment with the grooveengaged thereby as the said drum and lug rotate,

. and said lug being formed at the rear part of the In describing theinvention reference has been made only to the thread guiding means. Theother parts of the winding machine may have any known or preferredconstruction and I deem it not necessary to describe the same. Thethread guide may be used in connection with winding machines of anytype, and it may also be used in twisting machines. a

I claim:

1. A thread guiding mechanism for thread winding apparatus, comprising,in combination with the bobbin on which the thread is to be wound, arotary drum mounted withits axis parallel to the said bobbin and formedwith substantially helical intersecting grooves having opposite pitches,the improvement described herein, which consists in subsidiary threadguiding means in position for guiding the thread passing a point wheresaid grooves intersect and to hold the same substantially in alignmentwiththe groove engaged by the thread, such means consisting of anabutment upon which the drumguided thread makes bearing, the point ofbearing advancing longitudinally of the drum as the drum turns.

2. In a thread guiding mechanism as defined in claim 1, the furtherimprovement described herein, which consists in the said subsidiaryguiding means being arranged for engaging the thread before and after itpasses the said point of inter-- section.

3. In a thread winding mechanism as defined in claim 1, the furtherimprovement described herein, which consists in the said subsidiarythread guiding means being in the form of a lug mounted for rotatingabout an axis parallel to the ams of said drum.

4. In a thread winding mechanism as defined in claim 1, the furtherimprovement described herein, which consists in the said subsidiarythread guiding means being in the form of a lug mounted for rotatingabout an axis parallel to the axis of said drum, said lug being formedwith a thread engaging or guiding portion extending from the pointlocated forwardly in the direction of the rotary movement of said luglaterally and rearwardly of the axis of said lug and shaped so as tocontinuously hold said thread substantially in alignment with the grooveengaged" thereby as the said drum and lug rotate. i

means are provided for each point of intersection laterally andrearwardly directed portion with a portion adapted to guide the threadas it is being disengaged from said lug.

6. In a thread guiding mechanism as defined in claim 1, the furtherimprovement described herein, in which two subsidiary thread guiding onefor guiding said thread engaging in one of the intersecting grooves andthe other one for guiding the thread moving in the other one or saidintersecting grooves.

7. In a thread guiding mechanism as defined in claim 1, in which thegrooves made on said drum have a plurality of points of intersection,

the further improvement described herein, which.

consists in two subsidiary guiding members being provided for each pointof intersection, one of said guiding members of each'pair guiding saidthread engaging in one of said grooves and the other one guiding saidthread engaging in the in claim 1, the further improvement describedherein, which consists in the subsidiary guiding member being mounted ona roller disposed with its axis parallel to the axis of said drum, saidroller being located so as to be in frictional engagement with thethread moving onto said drum.

9. In a thread guiding mechanism as .defined in claim 1, the furtherimprovement described herein, which consists in the said thread guidingmechanism comprising a rotatable shaft disposed with its axis parallelto the axis of said drum and a lug on said shaft having a threadengaging portion directed from the forward point of the lug laterallyand rearwardly of said shaft, said lug being formed at the part engagingthe thread with a wall disposed substantially radially of the shaft andhaving a rounded margin.

10. In a thread guiding mechanism as defined in claim 1, 'the furtherimprovement described herein, which consists in the said thread guidingmechanism comprising a rotary shaft and a thread engaging lug carried bysaid shaft, and

means for rotating said drum and shaft in opposite directions, saidshaft carrying the lug having a number of revolutions relatively to thenumber of revolutions of said drum a multiple of that needed for'settingsaid lug into thread guiding position relatively to the point ofintersection associated therewith.

ICH DERSEN.

